Use weak dependency to enable mongocrypt on bson-2 and bson-3 feature

Author: tottoto

Cargo.toml

@@ -32,8 +32,8 @@ exclude = [
 default = ["compat-3-0-0", "rustls-tls", "dns-resolver"]
 compat-3-0-0 = ["compat-3-3-0", "bson-2"]
 compat-3-3-0 = []
-bson-2 = ["dep:bson2", "mongocrypt/bson-2"]
-bson-3 = ["dep:bson3", "mongocrypt/bson-3"]
+bson-2 = ["dep:bson2", "mongocrypt?/bson-2"]
+bson-3 = ["dep:bson3", "mongocrypt?/bson-3"]
 sync = []
 rustls-tls = ["dep:rustls", "dep:tokio-rustls", "dep:webpki-roots"]
 openssl-tls = ["dep:openssl", "dep:openssl-probe", "dep:tokio-openssl"]